Archived posting to the Leica Users Group, 2014/07/02

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Subject: [Leica] OT: Fuji X file sizes
From: hopsternew at gmail.com (Geoff Hopkinson)
Date: Thu, 3 Jul 2014 07:16:22 +1000
References: <F4089BDF-D730-4E7F-903C-55C0C9AF5067@frozenlight.eu> <53B4483C.9040201@cox.net> <662D319B-5659-4423-9DB7-86EE9A7A5644@bex.net>

Howard a DNG is essentially a TIFF with some more instructions.


Cheers
Geoff
http://www.pbase.com/hoppyman


On 3 July 2014 06:41, Howard Ritter <hlritter at bex.net> wrote:

> This file-size difference is intrinsic to TIFF, which interpolates a value
> for all 3 colors, R-G-B, for each pixel.
>
> The X-Pro 1 has a 24-Mpx sensor, 8 million for each of R, G, and B (this
> is simplified), each of which generates 1 byte of luminance information. So
> its raw (adjective, not acronym!) file size is 1 byte x 8 Mpx x 3 
> colors--to
> a first approximation, 24 MB. If JPEGed for storage, it is re-expanded when
> viewed. When the image is viewed or printed, software gives each R
> photosite also a G and a B value by interpolation from adjacent G and B
> photosites, and likewise for native G and B photosites. So the full image
> you see in Photoshop should have a file size of ~72MB. TIFF is simply this
> full file, with interpolated colors at each pixel. That's why it's always
> generally about 3 x the size of the stripped-down raw file. Differences
> seen in practice may result from compression, which can save significant
> storage capacity without loss of information (unlike JPEG). There may be
> some housekeeping stuff that brings your TIFF file to 4 x your raw; perhaps
> the file also incorporates a separate raw image.
>
> I don't know how this relates to DNG, though.
>
> --howard
>
>
> On Jul 2, 2014, at 1:58 PM, Ken Carney <kcarney1 at cox.net> wrote:
>
> > I hadn't really looked either.  My X raw files are about 24-27 MB (not
> sure what causes the size differential), opening to 94MB Tiff's.   My Canon
> 5D MkII files are roughly the same raw size, but open to 120+ MB Tiff's.
> >
> > Ken
>
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Replies: Reply from mark at rabinergroup.com (Mark Rabiner) ([Leica] OT: Fuji X file sizes)
In reply to: Message from kcarney1 at cox.net (Ken Carney) ([Leica] OT: Fuji X file sizes)
Message from hlritter at bex.net (Howard Ritter) ([Leica] OT: Fuji X file sizes)